对一种镍基单晶高温合金在两种蠕变条件下(760℃/780 MPa和982℃/248 MPa)的变形机制进行分析.结果表明:在中温高应力条件下(760℃/780 MPa),在低应变阶段,位错以堆垛层错的形式切入γ′相;高应变阶段,位错以位错对的方式切入γ′相.在高温低应力条件下(982℃/248 MPa)的低应变阶段,母相a/2〈110〉位错在基体中运动弓出,并绕过γ′相,发生位错反应而形成位错网;高应变阶段与中温高应力条件的切入机制相同.
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